LLC battery chargers utilize a power-conversion technology called resonant LLC topology, hence the name. LLC stands for inductor-capacitor-capacitor, and it is a type of resonant converter employing a resonant tank circuit along with a load network. This technology allows for the efficient and safe charging of lithium-ion batteries, which are commonly used in portable electronics and other applications.

The resonant LLC topology allows for high-frequency switching with minimal losses, as the switching is synchronized with the resonant frequency of the inductor-capacitor-capacitor circuit. This results in lower heat generation and higher energy efficiency compared to other charging technologies.

LLC battery chargers also employ a microcontroller to manage the charging process, monitoring battery voltage and current to ensure optimal charging performance and safety. The microcontroller regulates the charging current and voltage, and also provides important protection features such as overcharge and overheat protection.

Overall, the technology behind LLC battery chargers allows for efficient, safe, and reliable charging of lithium-ion batteries, making them an ideal choice for a wide range of applications.